Do you happen to know what model or year they were manufactured?
I have a pair of Technica Hot Form boots and I really like 'em...but I have no personal experience with the TNT Icon boots.

However, I have heard some of the old models (99's & 02's) had some problems with the plastic. Apparently (from what I've heard & read) there were some occasions where the plastic simply cracked/shattered beyond repair. I would imagine this issue has been fixed on the newer models.

If you have more info on the boots let me know & I'll see what I can find out.

On the side of the boot they say Icon TNT x.
As for the year I do not know as I got them at my local sport shop used.
They are bright orange and have some black parts.
If there is anything else you can tell me that would be great.